void WaitingForYou::fillIB()
{
int w = _mapWidth - 1;
if (_lod >= 1)
{
w -= (int)(_mapWidth * getSeriesSum(0.5, _lod));
}
_triangleNumber2GPU = w * w * 2;
int offset = Euler::Basic::power(2, _lod);
if (++_lod >= 8)
{
_lod = 0;
}
void* data = _ib->lock(0, 0, Euclid::eLock_Null);
u16* dataIndex = (u16*)data;
for (int i = 0; i < _mapWidth - 1;i += offset)
{
for (int j = 0; j < _mapWidth - 1; j += offset)
{
u16 baseIndex = j + i * _mapWidth;
u16 indices[] =
{
baseIndex, baseIndex + _mapWidth * offset, baseIndex + offset,
baseIndex + _mapWidth * offset, baseIndex + offset + _mapWidth * offset, baseIndex + offset
};
memcpy(dataIndex, indices, sizeof(u16) * 6);
dataIndex += 6;
}
}
_ib->unLock();
}
void WaitingForYou::toggleLOD()
{
//
if (_ib)
{
_ib->destroy();
//delete _ib;
//_ib = NULL;
}
{
static int lod = 0;
int w = _mapWidth - 1;
if (lod >= 1)
{
w -= (int)(_mapWidth * getSeriesSum(0.5, lod));
}
int offset = Euler::Basic::power(2, lod);
_triangleNumber2GPU = w * w * 2;
if (_ib)
{
_ib->create(_triangleNumber2GPU * 3 * sizeof(u16), Euclid::eUsage_WriteOnly, Euclid::eFormat_Index16,Euclid::ePool_Default);
}
else
{
_ib = _modules->getRenderEngine()->getBufferManager()->createIndexBuffer(_triangleNumber2GPU * 3 * sizeof(u16), Euclid::eUsage_WriteOnly, Euclid::eFormat_Index16,Euclid::ePool_Default);
}
void* data = _ib->lock(0, 0, Euclid::eLock_Null);
u16* dataIndex = (u16*)data;
for (int i = 0; i < _mapWidth - 1;i += offset)
{
for (int j = 0; j < _mapWidth - 1; j += offset)
{
u16 baseIndex = j + i * _mapWidth;
u16 indices[] =
{
baseIndex, baseIndex + _mapWidth * offset, baseIndex + offset,
baseIndex + _mapWidth * offset, baseIndex + offset + _mapWidth * offset, baseIndex + offset
};
memcpy(dataIndex, indices, sizeof(u16) * 6);
dataIndex += 6;
}
}
_ib->unLock();
++lod;
if (lod >= 8)
{
lod = 0;
}
}
}
// a + a*a + a*a*a + ...
float getSeriesSum(float a, int b)
{
if(b <= 1)
return a;
return Euler::Basic::power(a, b) + getSeriesSum(a, b - 1);
}